The American 60 used the Oliver 1550-1555 transmission and rear end. The American 80 used the 1655-White 2-70 transmission and read end.
The one big problem with the 60 was that the 1550-55 didn't have a differential lock. They tried to put one in the 60 by changing something in the pinion,don't remember just how it worked,but the early ones leaked in to the brake. They came up with an improvement and update kit,but they also drilled a hole to drain the oil out just in case. But so far as I know that was the only weakness.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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